Abstract

We demonstrate a 12km differential pulse-width pair Brillouin optical time-domain analysis (DPP- BOTDA) using 40ns and 50ns pulses with DC-coupled detection. A spatial resolution of 1m and a narrowband Brillouin gain spectrum of 33MHz are obtained simultaneously compared with 88MHz with the use of 10ns pulses in a conventional BOTDA. The experimental results show that the differential Brillouin gain of a 40/50ns pulse pair is 7 times stronger than the direct Brillouin gain of BOTDA with the use of a 10ns pulse, and the temperature uncertainty is 0.25°C compared with 1.8°C for a 10ns pulse. As the pulse-width difference decreases from 10ns to 1ns, corresponding to a spatial resolution from 1m to 10cm, the prediction of temperature uncertainty will only increase from 0.25°C to 0.8°C for DPP-BOTDA over a 12km long single-mode fiber.

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